A350189 - cp's OEIS frontend

A350189 Triangle T(n,k) read by rows: the number of symmetric binary n X n matrices with k ones and no all-1 2 X 2 submatrix.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	2
7	1
8	3
9	6
10	10
11	9
12	9
13	4
14	1
15	4
16	12
17	28
18	46
19	72
20	80
21	80
22	60
23	16
24	1
25	5
26	20
27	60
28	140
29	296
30	500
31	780
32	1005
33	1085
34	992
35	560
36	170
37	1
38	6
39	30
40	110
41	330
42	876
43	1956
44	4020
45	7140
46	11480
47	16248
48	19608
49	20560
50	16500
51	9720
52	3276
53	360
54	1
55	7
56	42
57	182
58	665
59	2121
60	5852
61	14792
62	33117
63	68355
64	126994
65	214158

[1, 1, 1, 1, 2, 2, 2, 1, 3, 6, 10, 9, 9, 4, 1, 4, 12, 28, 46, 72, 80, 80, 60, 16, 1, 5, 20, 60, 140, 296, 500, 780, 1005, 1085, 992, 560, 170, 1, 6, 30, 110, 330, 876, 1956, 4020, 7140, 11480, 16248, 19608, 20560, 16500, 9720, 3276, 360, 1, 7, 42, 182, 665, 2121, 5852, 14792, 33117, 68355, 126994, 214158]

cp's OEIS Frontend

A350189 Triangle T(n,k) read by rows: the number of symmetric binary n X n matrices with k ones and no all-1 2 X 2 submatrix.

Table of values

List of values